NullIndexField.php

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<?php
 
class NullIndexField implements SearchIndexField {
 
    public function getMapping( SearchEngine $engine ) {
        return null;
    }
 
    public function setFlag( $flag, $unset = false ) {
        return $this;
    }
 
    public function checkFlag( $flag ) {
        return 0;
    }
 
    public function merge( SearchIndexField $that ) {
        return $that;
    }
 
    public function getEngineHints( SearchEngine $engine ) {
        return [];
    }
}